import router from './router'
import store from './store'
import { Message, MessageBox } from 'element-ui'
import NProgress from 'nprogress'
import 'nprogress/nprogress.css'
import { getToken } from '@/utils/auth'

NProgress.configure({ showSpinner: false })

const whiteList = ['/login', '/auth-redirect', '/bind', '/register']
const LOGIN_TIMESTAMP_KEY = 'william-login-at'
const LOGIN_MAX_AGE = 24 * 60 * 60 * 1000
let loginExpiredPromptActive = false

function getLoginTimestamp() {
  if (typeof window === 'undefined') return 0
  try {
    return Number(window.localStorage.getItem(LOGIN_TIMESTAMP_KEY) || 0)
  } catch (error) {
    return 0
  }
}

function clearLoginTimestamp() {
  if (typeof window === 'undefined') return
  try {
    window.localStorage.removeItem(LOGIN_TIMESTAMP_KEY)
  } catch (error) {
    // ignore storage cleanup errors
  }
}

function setLoginTimestamp() {
  if (typeof window === 'undefined') return
  try {
    window.localStorage.setItem(LOGIN_TIMESTAMP_KEY, Date.now().toString())
  } catch (error) {
    // ignore storage write errors
  }
}

router.beforeEach((to, from, next) => {
  NProgress.start()
  if (getToken()) {
    if (!loginExpiredPromptActive) {
      const storedAt = getLoginTimestamp()
      if (!storedAt) {
        setLoginTimestamp()
      } else if (Date.now() - storedAt > LOGIN_MAX_AGE) {
        loginExpiredPromptActive = true
        MessageBox.alert(
          '登录状态已超过24小时，为保障账号安全请重新登陆。',
          '登录信息过期',
          {
            confirmButtonText: '重新登陆',
            showClose: false,
            closeOnClickModal: false,
            closeOnPressEscape: false,
            type: 'warning'
          }
        )
          .then(() => {
            store
              .dispatch('LogOut')
              .catch(() => {})
              .finally(() => {
                clearLoginTimestamp()
                loginExpiredPromptActive = false
                next({ path: '/login', replace: true, query: { redirect: to.fullPath } })
                NProgress.done()
              })
          })
          .catch(() => {
            loginExpiredPromptActive = false
            NProgress.done()
            next()
          })
        return
      }
    }
    to.meta.title && store.dispatch('settings/setTitle', to.meta.title)
    /* has token*/
    if (to.path === '/login') {
      next({ path: '/' })
      NProgress.done()
    } else {
      if (store.getters.roles.length === 0) {
        // 判断当前用户是否已拉取完user_info信息
        store.dispatch('GetInfo').then(() => {
          store.dispatch('GenerateRoutes').then(accessRoutes => {
            // 根据roles权限生成可访问的路由表
            router.addRoutes(accessRoutes) // 动态添加可访问路由表
            next({ ...to, replace: true }) // hack方法 确保addRoutes已完成
          })
        }).catch(err => {
            store.dispatch('LogOut').then(() => {
              Message.error(err)
              next({ path: '/' })
            })
          })
      } else {
        next()
      }
    }
  } else {
    // 没有token
    if (whiteList.indexOf(to.path) !== -1) {
      // 在免登录白名单，直接进入
      next()
    } else {
      next(`/login?redirect=${to.fullPath}`) // 否则全部重定向到登录页
      NProgress.done()
    }
  }
})

router.afterEach(() => {
  NProgress.done()
})
